ISSN:
1573-1111
Keywords:
Zeolite synthesis
;
small port mordenite
;
ZSM-5
;
IR
;
XRD
;
sorption properties
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Zeolites ZSM-5 and mordenite were synthesized without the aid of a template, in the gel composition ofXSiO2 : Al2O3 :YNa2O: 1500 H2O, whereX = 20–40 andY = 3.5–10.0 at 463 K. After 48 h of crystallisation the aluminosilicate gel system yielded either ZSM-5 or mordenite and their mixtures as zeolitic phases in addition to α- quartz depending on the variation in oxide mole composition. Transformation of crystalline ZSM-5 to mordenite was accompanied by a lower yield of solid product as a result of an increase in SiO2/Al2O3 and Na2O/SiO2 ratios in the aluminosilicate gel. At constant Na2O/SiO2 ratio, the decrease in SiO2/Al2O3 in the gel mixture was operative in lowering the product SiO2/Al2O3 ratio. Similarly, at constant SiO2/Al2O3 the increase in Na2O/SiO2 in the gel decreased the product SiO2/Al2O3 ratio. The mordenite obtained was found to be of the small port variety. Crystalline phases obtained were further characterised by XRD, IR, SEM and sorption studies.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01053641
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